[1.4.5] Ported tile-entity updates

[noahDP1911]

What is the bug?

Terraria 1.4.5 only updates tile entities registered in TileEntity.UpdateEntities.
tModLoader directly added and removed modded tile entities from ByID and ByPosition, bypassing the new registration logic. Consequently, modded tile entities were not registered for updates.

How did you fix the bug?

Modded tile entities now require updates by default, preserving their previous behavior.
Placement, loading, and removal now use TileEntity.Add and TileEntity.Remove, keeping UpdateEntities, ByID, and ByPosition synchronized.
Documentation and tests were added for both updating tile entities and tile entities that opt out by setting RequiresUpdates to false.

Are there alternatives to your fix?

Mods could be required to set RequiresUpdates themselves, but this would silently break existing tile entities.
tModLoader could maintain a separate update loop, but using Terraria's existing registration methods avoids duplicating update behavior.

[Chicken-Bones]

Please remove the tests, they don't add much value relative to their maintenance cost. We will discuss the default for RequiresUpdates

[Chicken-Bones]

You can initialize the default value of RequiresUpdates to LoaderUtils.HasOverride(this, e => e.Update)